With quark-antiquark annihilation and creation in the first Born approximation, we study the reactions:
Based on the neutron and proton degrees of freedom, the low-lying energy levels, the
We study a spherically symmetric spacetime made of anisotropic fluid of which radial equation of state is given by
This work proposes a dynamical description of the 136Xe + p spallation at 1000 MeV/nucleon with the aim of probing the mechanism which rules the IMFs production. The isospin-dependent quantum molecular dynamics (IQMD) model is applied to describe the dynamical process of the spallation until the hot fragments with excitation energy less than a special value Estop are formed. The statistical code GEMINI is applied to simulate the light-particle evaporation of the hot fragments. It is found that the IMFs production is well described by the model when the Estop = 2 MeV/nucleon is used. But comparison of the mean neutron-to-proton ratios between the data and calculations indicates the value of Estop = 3 MeV/nucleon.
We confront the perturbativity problem in the real scalar quintuplet minimal dark matter model. In the original model, the quintuplet quartic self-coupling inevitably hits a Landau pole at a scale ~1014 GeV, far below the Planck scale. In order to push up this Landau pole scale, we extend the model with a fermionic quintuplet and three fermionic singlets which couple to the scalar quintuplet via Yukawa interactions. Involving such Yukawa interactions at a scale ~1010 GeV not only can keep all couplings perturbative up to the Planck scale, but also can explain the smallness of neutrino masses via the type-I seesaw mechanism. Furthermore, we identify the parameter regions favored by the condition that perturbativity and vacuum stability are both maintained up to the Planck scale.
BESIII data show a particular angular distribution for the decay of the
Whether an additional light scalar exists is an interesting topic beyond the Standard Model (SM), while nowadays we do not know exactly physics beyond the SM in the low mass region, e.g., the Atlas and CMS collaborations get inconsistent results at around 95 GeV in searching for light resonances in diphoton channel. Considering these, we study a light scalar in the Minimal Dilaton Model (MDM). Under the theoretical and latest experimental constraints, we sort the surviving samples into two scenarios according to the diphoton rate of the light scalar: the large-diphoton scenario (with
As a Higgs factory, The CEPC (Circular Electron-Positron Collider) project aims at precision measurements of the Higgs boson properties. A baseline detector concept, APODIS (A PFA Oriented Detector for the HIggS factory), has been proposed for the CEPC CDR (Conceptual Design Report) study. We explore the Higgs signatures at this baseline setup with
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